Proper DLLT performance requires palpation of a bony landmark to ensure that the abdominal muscles are functioning in a stabilizing role to maintain the pelvis in a position of posterior tilt as the legs are lowered. Without monitoring, the pelvis could be in a position of anterior tilt with the lumbar spine extended, resulting in hip flexor muscles performing the leg-lowering movement without a stabilizing contribution from the abdominal muscles.5 This aspect has an important clinical application because core stability and lumbar stabilization programs rely on the abdominal muscles functioning effectively in a stabilizing role.6 Currently there are limited objective criteria with which to measure core performance.